''In 1954 Kathryn Black's mother became one of the millions of people worldwide stricken with polio. A year later, as the Salk vaccine became widely available, the nation heaved a collective sigh of rel''

''In 1954 Kathryn Black's mother became one of the millions of people worldwide stricken with polio. A year later, as the Salk vaccine became widely available, the nation heaved a collective sigh of rel''